1640116642 has 4 divisors (see below), whose sum is σ = 2460174966. Its totient is φ = 820058320.

The previous prime is 1640116631. The next prime is 1640116703. The reversal of 1640116642 is 2466110461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2466110461 = 1879 ⋅1312459.

It can be written as a sum of positive squares in only one way, i.e., 1637092521 + 3024121 = 40461^2 + 1739^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410029159 + ... + 410029162.

Almost surely, 2^1640116642 is an apocalyptic number.

1640116642 is a deficient number, since it is larger than the sum of its proper divisors (820058324).

1640116642 is an equidigital number, since it uses as much as digits as its factorization.

1640116642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820058323.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 1640116642 is about 40498.3535714725. The cubic root of 1640116642 is about 1179.3016652264.

The spelling of 1640116642 in words is "one billion, six hundred forty million, one hundred sixteen thousand, six hundred forty-two".